A Pharmaceutical Researcher Is Studying a Target Protein Involved in the Signal

A pharmaceutical researcher is studying a target protein involved in the signal transduction and cellular response to TSH.  The protein is isolated and purified from thyroid follicular cells.  Further analysis reveals that the protein contains multiple alpha-helical regions.  Each of these regions is composed of approximately 20 amino acid residues consisting primarily of valine, alanine, and isoleucine.  This particular region of the protein most likely performs which of the following functions?

A) Anchoring to the cell membrane
B) Binding to an extracellular ligand
C) Binding to intranuclear DNA
D) Interacting with metal ions in transporting proteins
E) Phosphorylating tyrosine residues

Correct Answer:

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